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US20030046416A1 - Method of establishing logical connections in a synchronous digital communications network, as well as network elements and management system - Google Patents

Method of establishing logical connections in a synchronous digital communications network, as well as network elements and management system Download PDF

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Publication number
US20030046416A1
US20030046416A1 US09/887,658 US88765801A US2003046416A1 US 20030046416 A1 US20030046416 A1 US 20030046416A1 US 88765801 A US88765801 A US 88765801A US 2003046416 A1 US2003046416 A1 US 2003046416A1
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logical connections
data packets
network
network elements
nen
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US09/887,658
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Volkmar Heuer
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Individual
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Individual
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Priority to DE19740106A priority Critical patent/DE19740106A1/en
Priority to AU83086/98A priority patent/AU8308698A/en
Priority to EP98440196A priority patent/EP0902600B1/en
Priority to DE59801071T priority patent/DE59801071D1/en
Priority to ES98440196T priority patent/ES2159172T3/en
Priority to JP25554798A priority patent/JPH11168507A/en
Priority to US09/150,997 priority patent/US6205121B1/en
Priority to CNB981192300A priority patent/CN1190928C/en
Priority to CA002244289A priority patent/CA2244289A1/en
Application filed by Individual filed Critical Individual
Priority to US09/887,658 priority patent/US20030046416A1/en
Publication of US20030046416A1 publication Critical patent/US20030046416A1/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478—Provisions for broadband connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1605—Fixed allocated frame structures
    • H04J3/1611—Synchronous digital hierarchy [SDH] or SONET
    • H04J3/1617—Synchronous digital hierarchy [SDH] or SONET carrying packets or ATM cells
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0073—Services, e.g. multimedia, GOS, QOS
    • H04J2203/0075—Connection-oriented
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0098—Traffic aspects, e.g. arbitration, load balancing, smoothing, buffer management

Definitions

  • This invention relates to a method of establishing logical connections in a synchronous digital communications network as claimed in claim 1, to a network element for a synchronous digital communications network as claimed in claim 9, and to a management system as claimed in claim 11.
  • Data packets which originate, for example, from local area networks, are transmitted through data networks to respective addressees.
  • Such data packets originate particularly from Internet applications, are structured in accordance with the Internet protocol (IP), and have a source address and a destination address.
  • IP Internet protocol
  • IP packets are first placed in ATM cells and then transmitted over virtual channel connections through a synchronous digital communications network (SDH or SONET).
  • SDH synchronous digital communications network
  • IP Switch IP Switching: The Intelligence of Routing, the Performance of Switching”, Ipsilon Technical White Paper on IP Switching, February 1996, retrievable in the Internet at http://www.ipsilon.com/productinfo/wp-ipswitch.html
  • IP Switch IP Switch
  • This device is capable of identifying longer-duration sequences of data packets having the same source and destination addresses, so-called flows, by means of an address monitor, and to switch suitable connections for these flows in the hardware. This increases the throughput of data packets through the IP switch and shortens the mean switching time.
  • This too, has the disadvantage that only predetermined logical connections can be used, which are either underdimensioned or overdimensioned, depending on the current payload.
  • One advantage of the invention is that transmission capacities can be better utilized for the transmission of data packets and that the average transmission rate is higher than in the prior art.
  • Other advantages are that commercially available IP routers can be used, and that no changes to the equipment of a user wishing to transmit data packets over the communications network are necessary.
  • source-address monitoring is additionally performed. This makes it possible to determine charges for transmitted data packets.
  • data packets with predetermined source or destination addresses are given a higher priority during transmission.
  • FIG. 1 shows two local area networks (LANs) interconnected by a synchronous digital communications network
  • FIG. 2 a shows a configuration of a communications network for high data traffic between adjacent users
  • FIG. 2 b shows a configuration of a communications network for high data traffic between users located remote from each other.
  • FIG. 1 there are shown two local data networks LAN 1 , LAN 2 which are interconnected by a synchronous digital communications network SDH and can exchange data packets via this network.
  • the gateways from the local area networks to the communications network SDH are provided by routers RTR 1 , RTR 2 .
  • Each of the latter is connected to a network element NE 1 , NE 2 of the network SDH.
  • a logical connection exists through the network SDH over which the data packets to be transmitted are transported.
  • data packets are to be transmitted from the first local area network LAN 1 to the second local area network LAN 2 , they are placed (“packetized”) in synchronous transport modules or subunits of such synchronous transport modules, so-called virtual containers VC-N (in SDH) or virtual tributaries VT (in SONET), in the first network element NE 1 , and transmitted to the second network element NE 2 , where they are unpacketized and passed to the second router RTR 2 .
  • virtual containers VC-N in SDH
  • VT virtual tributaries VT
  • PDH plesiochronous digital hierarchy
  • a logical connection (frequently also referred to as a virtual connection) is formed as two network elements periodically exchange subunits of synchronous transport modules, with the subunits being switched through other, intermediate network elements of the communications network SDH without being repacketized Virtual connections are established by a central network management system of the synchronous digital network SDH and have a fixed transmission capacity, i.e., they are permanent virtual connections.
  • a fundamental idea of the invention is to monitor in the communications network the destination addresses of the data packets to be transported, to determine therefrom the traffic volume between the individual network elements of the communications network, and, based on the traffic volume, to determine an optimized configuration of logical connections which is used to update the network.
  • the network is thus adapted to the current traffic volume, and the transmission capacities of the network are utilized in the best possible manner.
  • This approach is particularly suitable for IP data packets of Internet applications, but it is also applicable to data packets structured according to other protocols, preferably of OSI Layer 3, such as the IPX procotol of Novell Inc.
  • the monitoring of the destination addresses is performed in at least part of the network elements of the synchronous communications network.
  • the network elements include means for monitoring the destination addresses, e.g., an IP address monitor.
  • the determination of the traffic volume and the determination of an optimized configuration are performed in a central management system of the communications network.
  • the network elements notify the management system of results of the monitoring of the destination addresses, from which the management system can determine the traffic volume.
  • the interfaces e.g., a Q interface
  • instructions are then transmitted to the network elements relating to logical connections to be switched by the network elements. In this manner, the management system establishes the logical connections in the network in accordance with the optimized configuration.
  • an optimized configuration is determined periodically and the logical connections are updated periodically. This may be done, for example, every day, every hour, or every minute (pseudo-online), depending on the application.
  • FIGS. 2 a and 2 b show three network elements CC 1 -CC 3 of the synchronous digital communications network in one embodiment of the invention, the first and second network elements and the second and third network elements being physically interconnected by, e.g., optical fibers or coaxial cables, but the physical connections are not shown in the figure.
  • the connections shown are logical connections.
  • Each of the three network elements is connected via an interface to a central management system TMN. From the latter they can receive instructions as to which logical connections have to be switched internally.
  • TMN central management system
  • routers RTR 1 -RTR 3 Connected to the three network elements CC 1 -CC 3 are routers RTR 1 -RTR 3 , respectively, which provide the gateways from respective local area networks (not shown) to the communications network.
  • the router routes data packets from the local area network connected to it which are destined for an addressee in another local area network to the network elements connected to it, where they are packetized in subunits of synchronous transport modules and transmitted over one of the logical connections to a further network element.
  • the destination address of each data packet is monitored in the sending network element prior to the packetizing of the data packet.
  • the result of this monitoring is passed in the form of a message MTL to the central management system TMN. It is also possible to combine the results of the monitoring of two or more data packets to be transmitted and send them as one message MTL to the management system TMN.
  • the destination addresses of all data packets to be transmitted by the respective network element are monitored.
  • the results of the monitoring are communicated as messages MTL to the central management system TMN.
  • the management system TMN determines the current traffic volume from these messages, and from the current traffic volume, it determines an optimized configuration with which the logical connections in the communications network are then updated. To do this, the management system sends to the network elements instructions ANW relating to the logical connections to be switched by each network element.
  • the management system TMN will determine that a logical connection between the network elements CC 1 and CC 3 is necessary for an optimized configuration, and will send to the network elements CC 1 -CC 3 an instruction ANW to switch the corresponding connection, i.e., to switch a virtual container representative of the logical connection from the first network element CC 1 through the second network element CC 2 to the third network element CC 3 .
  • FIG. 2 b The optimized configuration for data traffic between the remote network elements CC 1 and CC 3 is shown in FIG. 2 b .
  • the optimization increases the throughput of IP packets and reduces the transmission delays through the communications network.
  • Another advantage is that at the gateways to the communications network, commercially available routers with commonly used interfaces can be employed, such as routers with E1, E3, E4, T1, T3, DS1, DS3, OC-n, or STM-n interfaces.
  • the user equipment need not be modified, either.
  • the monitoring of the destination addresses is performed in crossconnectors which are designed to switch logical connections in a synchronous digital communications network.
  • the routers may be provided with an interface to the central management system for informing the management about the current traffic situation.
  • a further development of the invention consists of monitoring not only the destination addresses of the data packets, but also the source addresses. In this manner, charging for the transmission of data packets can be implemented, for example by simply counting the transmitted data packets for each source.
  • data packets selected according to predetermined criteria are given preferential treatment, i.e., higher priority.
  • criteria may be particularly the source or destination addresses of the data packets.
  • a more reliable and faster data link can be made available to selected users, for example to users paying a higher tariff.
  • experience gained in cyclically occurring traffic situations are taken into account in determining the optimized configuration.
  • experience may be gained, for example, by statistical eveluation over prolonged periods of time or from the typical behavior of individual users. For instance, it may be known from observations that every Sunday night, two users exchange data with a high data traffic volume. The transmission capacity regularly required for this transaction is then automatically made available in the form of a logical connection already shortly before the beginning of the data transfer and the connection is automatically released after termination of the transaction.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)

Abstract

A method of establishing logical connections in a synchronous communications network (SDH) comprising a plurality of at least partially interconnected network elements (NE1, NEn; CC1-CC3) and designed for the transmission of data packets containing a destination address involves monitoring destination addresses of the data packets to be transmitted, determining the traffic volume between the individual network elements (NE1, NEn; CC1-CC3) with the aid of the destination addresses, and determining an optimized configuration of logical connections based on the traffic volume and existing logical connections. In this manner, the communications network is adapted to the current traffic situation, and the transmission capacities of the network are utilized in the best possible manner. The monitoring is advantageously done in at least part of the network elements, while the determination of the traffic volume and the optimized configuration is performed by a central management system (TMN).

Description

  • This invention relates to a method of establishing logical connections in a synchronous digital communications network as claimed in [0001] claim 1, to a network element for a synchronous digital communications network as claimed in claim 9, and to a management system as claimed in claim 11.
  • Data packets, which originate, for example, from local area networks, are transmitted through data networks to respective addressees. Such data packets originate particularly from Internet applications, are structured in accordance with the Internet protocol (IP), and have a source address and a destination address. As transmission media (OSI Layer 1) for long-haul data communications networks, synchronous digital networks based on the SDH or SONET standards and recommendations are used (SDH=Synchronous Digital Hierarchy, SONET=Synchronous Optical Network). This is stated, for example, in RFC 1619 (W. Simpson, Request for Comments 1619, Internet Engineering Task Force, Network Working Group, May 1994), which proposes to place data packets to be transferred over point-to-point links directly in synchronous transport modules (STM-N) of SDH or synchronous transport signals (STS-N) of SONET. [0002]
  • In synchronous digital communications networks, virtual, i.e., logical, connections can be switched between elements of the network. This is done manually with the aid of a management system. The switched logical connections are then used by routers of different data networks, which provide the gateways to the synchronous digital communications network, to transmit data packets. [0003]
  • Since applications of the Internet, in particular, produce widely time-varying data quantities (between 0 b/s and a few Mb/s) which have to be transmitted over the synchronous digital communications network in the form of IP data packets, the prior art has the disadvantage that either large transmission capacities have to be kept available in the communications network, which then remain unused most of the time, or that bottlenecks occur if several users want to send large amounts of data simultaneously. [0004]
  • In another concept, IP packets are first placed in ATM cells and then transmitted over virtual channel connections through a synchronous digital communications network (SDH or SONET). In an article published by Ipsilon Networks (“IP Switching: The Intelligence of Routing, the Performance of Switching”, Ipsilon Technical White Paper on IP Switching, February 1996, retrievable in the Internet at http://www.ipsilon.com/productinfo/wp-ipswitch.html), a device (IP Switch) is presented which combines the functions of an IP router and an ATM switch. This device is capable of identifying longer-duration sequences of data packets having the same source and destination addresses, so-called flows, by means of an address monitor, and to switch suitable connections for these flows in the hardware. This increases the throughput of data packets through the IP switch and shortens the mean switching time. This, too, has the disadvantage that only predetermined logical connections can be used, which are either underdimensioned or overdimensioned, depending on the current payload. [0005]
  • It is an object of the invention to provide a method whereby a synchronous digital communications network can be better adapted to time-varying data traffic. Further objects of the invention are to provide a network element and a management system for a synchronous digital communications network which are suited for carrying out the method. [0006]
  • The objects are attained by the features of [0007] claims 1, 9, and 11, respectively.
  • One advantage of the invention is that transmission capacities can be better utilized for the transmission of data packets and that the average transmission rate is higher than in the prior art. Other advantages are that commercially available IP routers can be used, and that no changes to the equipment of a user wishing to transmit data packets over the communications network are necessary. [0008]
  • In a preferred embodiment of the invention, source-address monitoring is additionally performed. This makes it possible to determine charges for transmitted data packets. [0009]
  • In another preferred embodiment of the invention, data packets with predetermined source or destination addresses, e.g., all data packets from or for an individual, predetermined user, are given a higher priority during transmission.[0010]
  • One embodiment of the invention will now be described with reference to the accompanying drawing, in which: [0011]
  • FIG. 1 shows two local area networks (LANs) interconnected by a synchronous digital communications network; [0012]
  • FIG. 2[0013] a shows a configuration of a communications network for high data traffic between adjacent users; and
  • FIG. 2[0014] b shows a configuration of a communications network for high data traffic between users located remote from each other.
  • Referring to FIG. 1, there are shown two local data networks LAN[0015] 1, LAN2 which are interconnected by a synchronous digital communications network SDH and can exchange data packets via this network. The gateways from the local area networks to the communications network SDH are provided by routers RTR1, RTR2. Each of the latter is connected to a network element NE1, NE2 of the network SDH. Between these two network elements NE1, NE2, a logical connection exists through the network SDH over which the data packets to be transmitted are transported. If data packets are to be transmitted from the first local area network LAN1 to the second local area network LAN2, they are placed (“packetized”) in synchronous transport modules or subunits of such synchronous transport modules, so-called virtual containers VC-N (in SDH) or virtual tributaries VT (in SONET), in the first network element NE1, and transmitted to the second network element NE2, where they are unpacketized and passed to the second router RTR2. Besides SDH and SONET systems, plesiochronous digital hierarchy (PDH) transmission systems must be regarded as synchronous digital networks in the sense of the invention.
  • A logical connection (frequently also referred to as a virtual connection) is formed as two network elements periodically exchange subunits of synchronous transport modules, with the subunits being switched through other, intermediate network elements of the communications network SDH without being repacketized Virtual connections are established by a central network management system of the synchronous digital network SDH and have a fixed transmission capacity, i.e., they are permanent virtual connections. [0016]
  • A fundamental idea of the invention is to monitor in the communications network the destination addresses of the data packets to be transported, to determine therefrom the traffic volume between the individual network elements of the communications network, and, based on the traffic volume, to determine an optimized configuration of logical connections which is used to update the network. The network is thus adapted to the current traffic volume, and the transmission capacities of the network are utilized in the best possible manner. This approach is particularly suitable for IP data packets of Internet applications, but it is also applicable to data packets structured according to other protocols, preferably of OSI [0017] Layer 3, such as the IPX procotol of Novell Inc.
  • Particularly advantageously, the monitoring of the destination addresses is performed in at least part of the network elements of the synchronous communications network. To this end, the network elements include means for monitoring the destination addresses, e.g., an IP address monitor. Alternatively, the use of a separate address monitor looped into a connection path of the network is possible. In another preferred embodiment, the determination of the traffic volume and the determination of an optimized configuration are performed in a central management system of the communications network. The network elements notify the management system of results of the monitoring of the destination addresses, from which the management system can determine the traffic volume. Via the interfaces (e.g., a Q interface) providing the connection between the management system and the network elements, instructions are then transmitted to the network elements relating to logical connections to be switched by the network elements. In this manner, the management system establishes the logical connections in the network in accordance with the optimized configuration. [0018]
  • Advantageously, an optimized configuration is determined periodically and the logical connections are updated periodically. This may be done, for example, every day, every hour, or every minute (pseudo-online), depending on the application. [0019]
  • FIGS. 2[0020] a and 2 b show three network elements CC1-CC3 of the synchronous digital communications network in one embodiment of the invention, the first and second network elements and the second and third network elements being physically interconnected by, e.g., optical fibers or coaxial cables, but the physical connections are not shown in the figure. The connections shown are logical connections. Each of the three network elements is connected via an interface to a central management system TMN. From the latter they can receive instructions as to which logical connections have to be switched internally. Connected to the three network elements CC1-CC3 are routers RTR1-RTR3, respectively, which provide the gateways from respective local area networks (not shown) to the communications network. The router routes data packets from the local area network connected to it which are destined for an addressee in another local area network to the network elements connected to it, where they are packetized in subunits of synchronous transport modules and transmitted over one of the logical connections to a further network element.
  • According to the invention, the destination address of each data packet is monitored in the sending network element prior to the packetizing of the data packet. The result of this monitoring is passed in the form of a message MTL to the central management system TMN. It is also possible to combine the results of the monitoring of two or more data packets to be transmitted and send them as one message MTL to the management system TMN. [0021]
  • In the configuration shown in FIG. 2[0022] a, there are two logical connections between every two adjacent network elements, while there is no logical connection between the two remote network elements CC1 and CC3. This configuration is suitable for high data traffic volumes between the adjacent network elements CC1, CC2 and CC2, CC3. Traffic between remote network elements, i.e., data packets to be sent from CC1 to CC3, must be depacketized in CC2, passed to the associated router RTR2, checked there, and returned to CC2, from where they can then be transmitted to CC3.
  • In all three network elements, the destination addresses of all data packets to be transmitted by the respective network element are monitored. The results of the monitoring are communicated as messages MTL to the central management system TMN. The management system TMN determines the current traffic volume from these messages, and from the current traffic volume, it determines an optimized configuration with which the logical connections in the communications network are then updated. To do this, the management system sends to the network elements instructions ANW relating to the logical connections to be switched by each network element. [0023]
  • If increased data traffic occurs between the remote network elements CC[0024] 1 and CC3, the management system TMN will determine that a logical connection between the network elements CC1 and CC3 is necessary for an optimized configuration, and will send to the network elements CC1-CC3 an instruction ANW to switch the corresponding connection, i.e., to switch a virtual container representative of the logical connection from the first network element CC1 through the second network element CC2 to the third network element CC3.
  • The optimized configuration for data traffic between the remote network elements CC[0025] 1 and CC3 is shown in FIG. 2b. The optimization increases the throughput of IP packets and reduces the transmission delays through the communications network.
  • From the IP routers, such an optimization of the communications network would not be possible, since the IP routers have no knowledge of the topology of the network. By contrast, newly established or no longer existing logical connections can be automatically identified and used or circumvented by the routers, for example by the polling method. Therefore, after short identification times, the transmission network dynamically optimized by the method according to the invention can be used by routers for routing. [0026]
  • Another advantage is that at the gateways to the communications network, commercially available routers with commonly used interfaces can be employed, such as routers with E1, E3, E4, T1, T3, DS1, DS3, OC-n, or STM-n interfaces. The user equipment need not be modified, either. [0027]
  • Advantageously, the monitoring of the destination addresses is performed in crossconnectors which are designed to switch logical connections in a synchronous digital communications network. [0028]
  • Instead of providing network elements with IP monitors for monitoring the destination addresses, the routers may be provided with an interface to the central management system for informing the management about the current traffic situation. [0029]
  • A further development of the invention consists of monitoring not only the destination addresses of the data packets, but also the source addresses. In this manner, charging for the transmission of data packets can be implemented, for example by simply counting the transmitted data packets for each source. [0030]
  • According to another development of the invention, data packets selected according to predetermined criteria are given preferential treatment, i.e., higher priority. Such criteria may be particularly the source or destination addresses of the data packets. In this manner, a more reliable and faster data link can be made available to selected users, for example to users paying a higher tariff. [0031]
  • According to a further development of the invention, experience gained in cyclically occurring traffic situations are taken into account in determining the optimized configuration. Such experience may be gained, for example, by statistical eveluation over prolonged periods of time or from the typical behavior of individual users. For instance, it may be known from observations that every Sunday night, two users exchange data with a high data traffic volume. The transmission capacity regularly required for this transaction is then automatically made available in the form of a logical connection already shortly before the beginning of the data transfer and the connection is automatically released after termination of the transaction. [0032]

Claims (11)

1. A method of establishing logical connections in a synchronous digital communications network (SDH) comprising a plurality of at least partially interconnected network elements (NE1, NEn; CC1-CC3) designed for the transmission of data packets each containing a destination address, said method comprising the steps of:
monitoring the destination addresses of the data packets to be transmitted;
determining a current traffic volume between the individual network elements (NE1, NEn; CC1-CC3) with the aid of the destination addresses;
determining an optimized configuration of logical connections based on the traffice volume and existing logical connections; and
updating the logical connections in the synchronous digital communications network (SDH) with the optimized configuration.
2. A method as claimed in claim 1 wherein the determination of the optimized configuration and the updating of the logical connections are performed periodically.
3. A method as claimed in claim 1 wherein the the data packets are packets structured in accordance with the Internet protocol.
4. A method as claimed in claim 1 wherein the monitoring of the destination addresses is performed in at least part of the network elements (NE1, NEn; CC1-CC3) of the synchronous digital communications network.
5. A method as claimed in claim 1 wherein the determination of the traffic volume and the determination of an optimized configuration are made by a central management system (TMN) of the synchronous digital communications network (SDH).
6. A method as claimed in claim 1 wherein in addition, the source addresses are monitored and a charge for transmitted data packets is determined therefrom.
7. A method as claimed in claim 1 or 6 wherein data packets with predetermined source or destination addresses are given a higher priority during transmission.
8. A method as claimed in claim 1 wherein the determination of the optimized configuration is also based on experience gained in cyclically occurring traffic situations.
9. A network element (NE1, NEn; CC1-CC3) for a synchronous digital communications network (SDH) comprising a plurality of at least partially interconnected network elements and designed for the transmission of data packets, said network elements (NE1, NEn; CC1-CC3) comprising:
means for monitoring destination addresses of the data packets to be transmitted; and
an interface to a central management system (TMN) for sending messages (MTL) containing the destination addresses of the data packets to be transmitted and for receiving instructions (ANW) relating to logical connections to be switched, the central management system (TMN) being provided for establishing the logical connections in the communications network (SDH).
10. A network element as claimed in claim 9 which is a crossconnector (CC1-CC3).
11. A management system (TMN) for a synchronous digital communications network (SDH) comprising a plurality of at least partially interconnected network elements (NE1, NEn; CC1-CC3) and designed for the transmission of data packets, said management system (TMN) comprising:
interfaces to the network elements (NE1, NEn; CC1-CC3) of the synchronous digital communications network (SDH) for receiving messages (MTL) containing destination addresses of the data packets to be transmitted and for sending to the network elements (NE1, NEn; CC1-CC3) instructions (ANW) relating to logical connections to be switched;
means for determining a current traffic volume between the network elements based on the messages (MTL) containing the destination addresses of the data packets to be transmitted;
means for determining an optimized configuration of logical connections between the network elements (NE1, NEn; CC1-CC3) based on the existing logical connections and the traffic volume; and
means for sending to the network elements (NE1, NEn; CC1-CC3) instructions (ANW) relating to the logical connections to be switched in accordance with the optimized configuration.
US09/887,658 1997-09-12 2001-07-30 Method of establishing logical connections in a synchronous digital communications network, as well as network elements and management system Abandoned US20030046416A1 (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
DE19740106A DE19740106A1 (en) 1997-09-12 1997-09-12 Method for establishing logical connections in a synchronous digital communication network, network element and management system
AU83086/98A AU8308698A (en) 1997-09-12 1998-09-03 Method of establishing logical connections in a synchronous digital communications network
DE59801071T DE59801071D1 (en) 1997-09-12 1998-09-07 Method for establishing logical connections in a synchronous digital communication network, network element and management system
ES98440196T ES2159172T3 (en) 1997-09-12 1998-09-07 PROCEDURE TO ESTABLISH LOGICAL LINKS IN A DIGITAL SYNCHRONOUS TELECOMMUNICATIONS NETWORK, NETWORK ELEMENT AND ADMINISTRATION SYSTEM.
EP98440196A EP0902600B1 (en) 1997-09-12 1998-09-07 Method for establishing logical connections in a synchronous digital data communication network , network element and management system
JP25554798A JPH11168507A (en) 1997-09-12 1998-09-09 Method, network element and management system for establishing a logical connection in a synchronous digital communication network
US09/150,997 US6205121B1 (en) 1997-09-12 1998-09-10 Method of establishing logical connections in a synchronous digital communications network, as well as network elements and management system
CNB981192300A CN1190928C (en) 1997-09-12 1998-09-11 Method of establishing logical connections in synchronous digital communications networks, as well as network elements and management system
CA002244289A CA2244289A1 (en) 1997-09-12 1998-09-11 Method of establishing logical connections in a synchronous digital communications network, as well as network elements and management system
US09/887,658 US20030046416A1 (en) 1997-09-12 2001-07-30 Method of establishing logical connections in a synchronous digital communications network, as well as network elements and management system

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AU8308698A (en) 1999-03-25
CA2244289A1 (en) 1999-03-12
EP0902600A3 (en) 1999-08-11
JPH11168507A (en) 1999-06-22
CN1227994A (en) 1999-09-08
DE19740106A1 (en) 1999-03-18
CN1190928C (en) 2005-02-23
DE59801071D1 (en) 2001-08-30
EP0902600B1 (en) 2001-07-25
EP0902600A2 (en) 1999-03-17
US6205121B1 (en) 2001-03-20
ES2159172T3 (en) 2001-09-16

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